This tutorial is designed for those who use Ubuntu desktop in proxy oriented environments. In such environments proxy must be configured no just for browsing Internet (you can configure only browser with proxy parameters), but for applications such as apt. Basically you will configure proxy as system setting.
In order to configure proxy go to options on top right corner and then select System Settings… (Slide 1. & 2.).
In System Settings select Network option and then select Proxy (Slide 3. & 4.).
Now insert Proxy IP address and TCP port for HTTP, HTTPS, FTP and socket, although it is not mandatory to configure all of these settings but only those you use (Slide 5).
Confirm configuration selecting Apply system wide by providing root password (Slide 6).
Proxy IP address will be given to you by proxy administrators, but there is numerous situations where you can use free proxies for anonymous browsing. Some of them you can find here. You can verify your configuration using Find my IP address search phrase in Google.
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